I just bought some seeds at Target and one site I found suggested soaking them in orange juice. Someone mentioned that maybe that would be similiar to what conditions the seeds in the fruit would be like, with the acid braking down the seed coat. Haven't tried it yet but am going to soon. Also suggested using gritty or sandy soil.

I slightly nick or file one end of the seed and then soak the seed in water (or water with liquid kelp if I have it). Germination can still be tricky even with all that. Many sources state that bottom heat will help, but I haven't used it myself (though I will be doing so this spring when germinating some seed I got from crosses I made!).

You're not "out", they're just all planted.
Have faith- I had the hardest time starting these things from seed when I started.. I simply gave up seeds & bought plants for several years. Then a couple years ago I got back into seeds, and Boy can some be a bear to get to germinate. Some I planted 2 years ago? Just came up a few months ago. So it can take AGES sometimes.

Now when I start them I soak 'em for a day or two in orange juice. (not 'sunny delight', get the real stuff) Then I plant them in seedling trays. I keep 'em moist, but don't bother with that 'greenhouse' clear cover thingy. Some I have over a heat-mat, seems to help sometimes. Usually I'll get germination in a couple weeks, but as I said sometimes it can take a year or more.. Sometimes by then I've recycled the seedling dirt, THEN they pop and I haven't a clue what I have. So don't give up. Ever.

Thanks for the feedback and help. I'll try some more and thanks for the not "sunny delight" because I had read in another thread about using citrus juice and yesterday we got some Sunny D and the first thing I thought of was; "Oh I'll have to save some to germinate the seeds I got. LOL.

Soaking in water is probably just as good as oj. However, keep in mind that two of the species you have listed are very cold hardy, incarnata and lutea. These seeds may require a cold stratification period. You can mix them in moist potting soil in a baggie and place in the refrigerator (don't zip 'em up, just fold the bag over so air exchanges some) for 1-2 months, then move to room temp.

Mr Brownthumbs, I'm also in zone 5 IL.
This is my first go with the seeds (passiflora mix)
I soaked them in warm lemon juice (which then cooled to room temp) for a day or two then potted them up and put them in a waterbed drawer (75+ F)

Out of approx 12 seeds two germinated shortly. I had them under lights hoping for new sprouts but I haven't seen any for weeks so i just moved them to a window.
Good luck,
Karen

Now I'm jealous! I think I'm going to wait til outside temps get warmer to try more seeds because I'm worried they'll go to waste and not germinate. But I'm keeping my fingers crossed with those I've started. If anything I can go back and buy more of the caerulea seeds, when the weather is warmer.